M8x1 left hand tap.

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M8x1 left hand tap.

Home Forums General Questions M8x1 left hand tap.

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  • #429434
    Pete Savage
    Participant
      @petesavage40461

      Hi guys!

      I'm making new lead screw nuts for my unimat but I'm having problems. Has anyone ordered an M8x1 left hand tap and received one that was actually correct? The eBay ones seem to all be absolute crap, with the pitch being closer to 1.1mm. I currently don't have access to a lathe with metric screw cutting facility so i can't have a go at making my own. Any trusted sources?

      Cheers,

      Pete

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      #26843
      Pete Savage
      Participant
        @petesavage40461
        #429436
        Nigel Graham 2
        Participant
          @nigelgraham2

          Try Tracy Tools. (01803 325603.

          Their catalogue states Left-hand taps & dies available, though more expensive than plain old right-hand. However, their quality and service are good, and they are one of "Our" established suppliers!

          I don't have an eBay account but I wouldn't buy anything that way unless it was a private second-hand sale (as the site was originally designed to handle), and then only with care! Judging by many comments I've seen, it seems to have become an outlet for manufacturers of bottom-of-the-range stuff.

          #429443
          Bill Pudney
          Participant
            @billpudney37759

            Drill Service at Horley would be another suggestion. I got a couple of M10 x 1.0 LH taps and a die from them, some time ago.

            cheers

            Bill

            #429445
            JasonB
            Moderator
              @jasonb

              Rotagrip have them and are usually do decent stuff though they do several brands of taps, they also have an e-bay shop.

              #429468
              Brian G
              Participant
                @briang

                I would definitely agree with the suggestions of Drill Service Horley (who I relied upon in my working life) and Tracy Tools, but would also add another. When I repaired my SL tailstock I didn't want to go to the expense of HSS for a one off, so I bought HBM carbon steel taps and die from RDG tools.

                They did the job perfectly, and I just re-checked the pitch. (I never thought to do so BEFORE using them as I tend rightly or wrongly to trust anything engraved not just with the size, pitch and direction, but also with the makers name AND the required drill size!

                Brian

                #429491
                Pete Savage
                Participant
                  @petesavage40461

                  I haven't rung up anyone yet but had a check on the websites, I found an RH m8x1 on tracy tools. 18 quid for the rotagrip HSS looks good as long as it is genuinely a 1mm pitch, 65% discount sounds a bit suspicious.

                  I must say the only reason I checked the pitch was because it was about a tenner for a set of 3, of a non standard pitch, and if that wasn't uncommon enough it is left hand!

                  The idea was to make phosphor bronze sacrificial anti backlash nuts to try and get the backlash and friction down to help with the fitting of CNC, so an investment in a tool likely to last a few sets sounds good.

                  #429521
                  Pete Savage
                  Participant
                    @petesavage40461

                    I just checked back through my emails, and my dodgy tap set did come from rdg tools. They offered me a refund if I sent it back recorded but that would have been half the value of the product.

                    None of the shops mentioned have one on stock so hopefully ordering they won't just get a bad one from rgd and pass it on!!

                    #429523
                    Tony Pratt 1
                    Participant
                      @tonypratt1
                      Posted by Pete Savage on 18/09/2019 15:44:50:

                      I just checked back through my emails, and my dodgy tap set did come from rdg tools. They offered me a refund if I sent it back recorded but that would have been half the value of the product.

                      None of the shops mentioned have one on stock so hopefully ordering they won't just get a bad one from rgd and pass it on!!

                      Pretty sure the retailer has to pay postage on faulty items as per UK consumer goods act[or similar distance selling regulations]

                      Tony

                      #429551
                      Brian G
                      Participant
                        @briang
                        Posted by Pete Savage on 18/09/2019 15:44:50:

                        I just checked back through my emails, and my dodgy tap set did come from rdg tools. They offered me a refund if I sent it back recorded but that would have been half the value of the product.

                        None of the shops mentioned have one on stock so hopefully ordering they won't just get a bad one from rgd and pass it on!!

                        You panicked me there Pete, so I cut a thread using the taper tap from my RDG set (bought in April 2017) and set up the plug tap as shown in this photo. 10 turns came to 10.01mm, (+/- perhaps 0.02mm, I don't think my judgement that the wrench was level was more than 5 degrees out). It looks like you got a bad batch, but the worry is, what is in their stock now?

                        Brian

                        20190918_180544.jpg

                        #429613
                        Nick Hulme
                        Participant
                          @nickhulme30114
                          Posted by Pete Savage on 18/09/2019 11:18:10:

                          he idea was to make phosphor bronze sacrificial anti backlash nuts to try and get the backlash and friction down to help with the fitting of CNC, so an investment in a tool likely to last a few sets sounds good.

                          If going the CNC route go straight to Ball Screws, suitably sized ones for your machine will not break the bank.

                          #429626
                          Pete Savage
                          Participant
                            @petesavage40461

                            I bought the tap September 2018, I lost interest in sending it back but it was bizarre because all 3 taps in the set were wrong according to my pitch gauge.

                            I would be interested to look into ball screws, but the unimat is absolutely tiny, I don't think anything more than the m8 leadscrew would fit in the cross slide area

                            #429644
                            Roderick Jenkins
                            Participant
                              @roderickjenkins93242

                              Looks like they could actually be 5/16 x 24 (UNF).

                              Rod

                              #429655
                              Niels Abildgaard
                              Participant
                                @nielsabildgaard33719

                                A continental source

                                MF8 LH

                                #429656
                                Pete Savage
                                Participant
                                  @petesavage40461

                                  Hopefully Roderick! At least that might actually be useful at some point!

                                  Below is the one I have just received from RotaGrip.

                                  20190919_181259.jpg

                                  And here is the RGD one!

                                  20190919_181141.jpg

                                  #429658
                                  JasonB
                                  Moderator
                                    @jasonb

                                    Good to see my suggestion of Rotagrip worked out, is it a brand name one or just one of their imported ones which I have found fine for threads you are not going to use much, I've a few fine pitch metric ones for them that crop up on gas fittings.

                                    Definately something wrong with that RDG one.

                                    #429660
                                    Pete Savage
                                    Participant
                                      @petesavage40461

                                      Yes, they ended up special delivering me one out for 4 quid postage which wasn't bad! Only ordered it yesterday!

                                      #429717
                                      Pete Savage
                                      Participant
                                        @petesavage40461

                                        It was branded TWT UK, never heard of them but looked of decent finish etc.

                                        #429749
                                        Pete Savage
                                        Participant
                                          @petesavage40461
                                           
                                          The nut worked amazingly even without any anti backlash mechanism. The handwheel free spins about 0.01mm worth which isn't too bad.

                                          Edited By Pete Savage on 20/09/2019 14:57:34

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